Materials Reports  2021, Vol. 35 Issue (Z1): 374-377 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Nb, Hf and Zr on Oxidation Resistance of γ-TiAl Alloy |
| LAI Xuping1, LI Tianfang1, LIU Rui2, SUN Hongliang2
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1 Naval Equipment Department, Chengdu 610036, China
2 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract Three kinds of alloys were melted by adding Nb, Hf and Zr elements on the basis of equal atomic ratio γ-TiAl based intermetallic compounds. The oxidation behavior of the three alloys in still air at 1 600 ℃ and at 700 ℃, 800 ℃ and 850 ℃ for 20 h was studied. The results show that there is an incubation period in the oxidation process of 4Nb-4Zr, 4Nb-4Hf and 8Nb at 1 600 ℃, and the rapid oxidation begins when the temperature rises above 1 000 ℃. However, there is no incubation period in the isothermal oxidation process at 700 ℃, 800 ℃ and 850 ℃, and the oxidation curve is parabolic. The parabolic constants Kp of the three alloys at 700 ℃, 800 ℃ and 850 ℃ were calculated and corrected. The oxide films of the three alloys are mainly composed of dense Al2O3 and loose TiO2. Alloying elements control the oxidation resistance of the alloy mainly by affecting the amount of dense Al2O3 in the oxide film. Hf plays an important role in improving the activity of Al in TiAl alloy. The amount of Al2O3 in the oxide film is the most, and the oxidation resistance of the alloy is the best. Nb is the second, Zr is the worst.
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Published: 16 July 2021
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| Fund:National Key R & D Program (2016YFB1200505). |
| About author:: Hongliang Sun, male, doctor, associate professor. Mainly engaged in the basic research of titanium aluminum alloy, hot isostatic pressing, hot pressing and other powder metallurgy process research work. He has successively presided over a number of National Natural Science Foundation, National Key R & D Projects and horizontal projects in related fields. As the first author or corresponding author, he published more than 30 papers in international journals such as Journal of Alloys and Compounds, Materials Research Innovations, Rare Metals, Materials & Manufacturing processes, and served as peer reviewer of many international journals. Nearly 10 patents have been applied.Xuping Lai, engineer of Haizhuang Xi'an Bureau, From September 1998 to July 2002, he obtained a bachelor's degree in materials science and engineering from Harbin Engineering University. After graduation, he has been engaged in nuclear power engineering project management and quality supervision. He has participated in the research and development of a number of national key projects, especially system design, equipment development and material research and development in the nuclear field. He has published more than 10 articles and won a third prize of national defense science and technology progress award third class meritorious service one by one, many times enjoy high-tech project subsidies. |
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